Clamp.



E. ADELL.

CLAMP.

APPLICATION FILED SEPT. 10, 1910.

993,940. Patented May 30, 1911.

ATTORNEYS IIITEE %TATE% PATNT FIQE.

EDWARD ADELL, OF ORANGE, MASSACHUSETTS.

CLAMP.

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To all whom it may comer Be it known that I, EDWARD ADELL, a citizen ofthe United States, and a resident of Orange, in the county of Franklinand State of Massachusetts, have invented a new and Improved Clamp, ofwhich the following is a full, clear, and exact description.

An object of the invention is to provide a clamp, of the screw clamptype, for removably clamping articles of various dimensions andproportions. For the purpose mentioned, use is made of handled clampingscrews, having clamping bars operat-ively mounted thereon, with means inone of the clamping bars for screw threadedly engaging the clampingscrews and means in the other clamping bar for preventing the said barfrom sliding longitudinally on one of the clamping screws.

In clamps now generally used, the screwthreaded connection between theclamping screw and the clamping bar is ofttimes made integral with theclamping bar, or rigidly connected thereto, thus involving considerablestrain on the threads of the connection and quickly wearing them out.Although I am aware that there are clamps having attachments thereon forpreventing the clamping bar from sliding on the clamping screw, the saidattachments are in most part of clumsy construction and depend solelyupon the elasticity of the material they are made of, for theirefficiency and durability. In my device, I provide a clamp having thescrewthreaded connection between the clamping bar and clamping screw sodisposed in the interior of the clamping bar, that the strain isproportionately caused to act on the sides of the bar and not altogetheron the threaded connection. Furthermore, I provide means on theloosely-engaged clamping bar for holding the clamping bar against thehandled end of the clamping screw, thus preventing any longitudinalsliding of the bars on the screw and producing a larger surface forreceiving the strain when an article is secured in my clamp.

Reference is to be had to the accompanying drawings constituting a partof this specification, in which similar characters of reference denotecorresponding parts in all the views, and in which Figure 1 is a sideelevation of my clamp; Fig. 2 is a sectional view of one of the clampingbars and taken on the line 2-2 in Fig. 1; Fig. 3 is a sectional View ofthe other Specification of Letters Yatent.

Application filed September 10, 1910.

Patented May 30, 1911.

Serial No. 581,402.

i clamping bar and taken on the line 3-3 in Fig. 1; Fig. 4 is a planview of the blank for forming the clamping bars; Fig. 5 is a perspectiveview of the winged nut; and Fig. 6 is a fragmentary sectional viewdisclosing the means on the clamping bar for preventing a longitudinalsliding of the bar on the clamping screw.

Referring more particularly to the drawings, use is made of clampingscrews 11, 12 having handles 13, 14L thereon, and operatively mounted onthe screws are clamping bars 15, 16. The bars 15, 16 are preferablyformed of a blank 17 having inclined edges 18 adapted to constitute thefront or clamping end 19 of the clamping bars and also having lugs 20and 22. The lugs 20, when bent to the desired shape, form the end 21 andthe lugs 22, when bent, form the rear curved end 23; the final form ofthe blank presents in effect a recessed bar. Perforations 24- are formedin the clamping bars, and the screws 11, 12 are adapted to passtherethrough, as will easily be seen in Fig. 1. The screw 12 is providedwith a smooth bearing end 25, adapted to turnably engage a seat 26 inthe bar 16. Interior of the bar 15 are loosely disposed screw threadednuts 27 having a body portion 28 and diverging wings 29, with aninternal thread 30 on the body portion 28, and a nut 31 is looselydisposed in the bar 16 and similar in construction to the nuts 27,except that the nut 31 is not provided with an internal thread 30. Onthe bar 16 a ring 32 is swaged and adapted to encircle the screw 11 toprevent the bar 16 from sliding longitudinally on the screw.

In the assembling of my device, the screw 11 is adapted to pass looselythrough the bar 16 and nut 31 and screw threadedly engage the nut 27 inthe bar 15, and the screw 12 is adapted to screw threadedly engage theother nut 27 in the bar 15, with the bearing end 25 of the screwturnably engaging the seat 26. After the screw 11 has been passedthrough the bars as mentioned, the ring 32 is swaged. on the bar 16 asshown in Fig. 6, and the clamp is then in operative condition.

To clamp an article in the clamp, the handles 13, 14 are grasped and thescrews 11, 12 are operated to separate the bars 15, 16 until the spacetherebetween is of sufficient width to receive the article to beclamped. The screws 11, 12 are then turned to bring the clamp intoengagement with the article and then by turning the screw 12 alone theclamping ends 19 will securely grip the article and hold the same.

From the foregoing description it will be seen that the ring 32 preventsany longitudinal sliding of the bar 16 on the screw 11, and the wings 29on the nuts 27 and 31, aside from transmitting the clamping strain tothe sides of the bars, prevent the nuts from turning in the bars 15 and16, While at the same time the said nuts are not secured in the bars butare loosely mounted therein.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

l. A clamp comprising screws and recessed clamping bars in engagementthere with; nuts carried by each screw and lying within the saidrecessed bars, the said nuts being provided with diverging end portionsengaging the side walls of the said recessed members, each nut and theend portions thereon being of integral format-ion, whereby the screwsmay be turned relatively to the nuts in order to clamp suitable materialbetween the clamping bars.

2. A clamp comprising clamping screws and recessed clamping bars inengagement therewith; a nut made of a single piece of metal bent at anintermediate portion, the end portions being diverging, the saidmaterial between the bent portion and the diverging portions being inengagement with each other, the said nut engaging the said clampingscrew and lying within the said recessed bar with the diverging portionsof the said nut in engagement with the side walls of the said recesseswhereby as the clamping screw is turned to hold suitable material withinthe clamp, the screw may move relatively to the nut which is held inposition within the recess.

3. A clamp comprising clamping screws and clamping bars in engagementtherewith, each of the said bars being formed of a single sheet of metalhaving the side portions thereof extending laterally to the centralportion thereof whereby a recessed formation is secured; nuts carried byeach clamp ing screw and lying within the said recesses, the said nutsbeing provided with diverging portions engaging the side walls of thesaid recesses, each nut and the diverging portions being constructedfrom a single piece of metal, whereby the screws may be turnedrelatively to the nuts in order to hold the material between theclamping bars.

4. A clamp comprising clamping screws and clamping bars in engagementtherewith; the said clamping bars being each made of a single piece ofmetal hav ing the side portions thereof bent and extending laterallywith respect to the central portion of the piece of metal wherebyrecessed clamping bars are formed, each of the said nuts being made froma single piece of metal, bent at a central portion and having divergingend portions, the said piece of metal having parts thereof between thesaid bent portion and the diverging port-ions in contact with eachother, the said nuts lying within the said recesses with the divergingportions engaging the side walls of the said recesses whereby the screwsmay be turned relatively to the nuts in order to hold suitable materialbetween the clamping bars.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD ADELL.

Witnesses:

S. J. BIRCH, FRANK THUNBERG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

